Implementation of eL2TP Based on Layer Two Tunnel Protocol in Linux
Zhang Yin-jiang · Jisuanji gongcheng · 2005
This paper analyzes L2TP security in theory and builds a VPN solution called enhancing layer two tunneling protocol(eL2TP) , which is combined with L2TP code in Linux.The solution modifies L2TP’s protocol structure and Header,substitues mutual tunnel authentication like MS-CHAPv2 for original authentication like CHAP, adds a multiple and random authentication after control connections establishment, data encryption, authentication and integrity of data packet, eL2TP can be compatible with L2TP and enhance security of VPN more than L2TP and take advantages of IPSec and PPTP. The new code has been debugged and executed in lab.This paper gives summarization refered to main L2TP code which is modified. At last, some key parameters are discussed.